CALGARY — When Samantha and Ricardo Urias left their 18-month-old son at their apartment with Samantha's cousin Brittany Mahingen and Brittany's mother Leanne to babysit early on the afternoon of Nov. 3, 2010, it was a usual day, a jury was told on Monday.

Neither Brittany, then 18, nor Leanne were intoxicated, there was no damage to the suite and the parents had no concerns, Crown prosecutor Julie Morgan said in her opening statement of Brittany Jewel Mahingen's second-degree murder trial.

When the child's parents returned several hours later at 10:30 p.m. from the Calgary Drop-In Centre, where Samantha volunteered and Ricardo worked, they initially got no response in their attempts to enter the apartment and finally were met at the door by Brittany and saw Leanne, 37, face down in the hall in a pool of blood.

Leanne Rose Mahingen was unresponsive when Ricardo turned her over. There were also holes in the bedroom and bathroom doors, there was blood on the hallway floor, the towel rack of the bathroom was off the wall and there was what appeared to be bloodstains in the bathroom and bedroom.

Morgan said Ricardo called 911 and attempted CPR on the victim, but despite his efforts, Leanne Mahingen died later in hospital.

Calgary police Const. Kim McDonald, who photographed the accused after she was arrested, said the teen was unco-operative and appeared to be highly intoxicated.

Brittany Mahingen also had bruises on her hands and legs, as well as cuts to the side of her feet, said McDonald. She said the accused had no injuries to her face or neck.

Morgan told the jury that evidence from the Uriases, neighbours, police and other experts will show that the accused is guilty as charged.

The trial before Court of Queen's Bench Justice Robert Hall and jury of eight women and four men is scheduled to last for nearly three weeks.